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Let r and s be the roots of y^2 - 19y + 7. Find (r-2)(s-2).

 Sep 12, 2015

Best Answer 

 #1
avatar+33616 
+5

Use the following to find the two roots:

 

\(y_{\pm}=\frac{19\pm \sqrt{19^2-4\times1\times7}}{2\times1}\)

 

Let r = y+, say, and s = y-

Can you take it from here?

 Sep 12, 2015
edited by Alan  Sep 12, 2015
 #1
avatar+33616 
+5
Best Answer

Use the following to find the two roots:

 

\(y_{\pm}=\frac{19\pm \sqrt{19^2-4\times1\times7}}{2\times1}\)

 

Let r = y+, say, and s = y-

Can you take it from here?

Alan Sep 12, 2015
edited by Alan  Sep 12, 2015
 #2
avatar+1310 
0

i still dont know

 Sep 12, 2015
 #3
avatar+1315 
+5

Well I not surprised you not know because everyone here except you have done your homework.  Your brain muscle is about the size of a peanut because you never use it.

 

There is no use overloading your brain now.

 

r = 31.903

s = 6.0965

 Sep 12, 2015

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